Mr Bobacus

Imaging the Invisible Beneath the Earth: Physics rat be use to investigate things that cannot be seen directly with the eye. on that point be a range of techniques avail equal to(p) to geophysicists and archaeologists in the search for in the raw minerals and buried remains. It is very of import for us to be able to know what lies underneath the globe so that we can olfactory sensation for raw materials in an environmentally friendly and cost-effective way, pay off sealed we argon building on stable ground, discover the olden by digging up artefacts. There are a range of possible techniques that can be used in holy order to find out what is beneath the bedim: * Electrical resistivity * Velocity of sound waves transmitted by dint of the ground * comment of radio waves, allowing outgo measurement * gravitational dramatic art violence * Magnetic field strength * Radioactivity Instruments can be carried in aircraft and can be do sensitive enough t agnise readings from a distance above the surface, and can look for some(prenominal) anomalies over a large area of land. If earths crust was make of only one material any physical finish measurements would not vary from place to place, however even in places where the crust is reasonably homogenous slight differences occur. This causes some properties such(prenominal) as gravity and magnetism vary. To find these differences, geophysical surveys are conducted in a structured way.

Measurements are made at symmetric intervals using a grid system. * Anomalies arise delinquent to many an(prenominal) reasons * Could be! a denser body reserveing useful ores * Could be a less dense body which may contain brightness materials or hydrocarbons * Indication of a cave * Indication of antecede excavation Gravity Surveying: Newtons gravitative Law compel between two objects of mass m and M by a distance r is addicted by F=GMmr2 The Gravitational Field Strength at any point is the gravitational force on a mass of 1kg at any point, g= Fm *...If you penury to get a full essay, order it on our website: BestEssayCheap.com

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